diff --git a/sys/src/cmd/unix/9pfreebsd/mount_9fs/Makefile b/sys/src/cmd/unix/9pfreebsd/mount_9fs/Makefile
index 9cf4469cf..758c41d43 100644
--- a/sys/src/cmd/unix/9pfreebsd/mount_9fs/Makefile
+++ b/sys/src/cmd/unix/9pfreebsd/mount_9fs/Makefile
@@ -2,7 +2,7 @@
 
 PROG=	mount_9fs
 SRCS=	mount_9fs.c getmntopts.c crypt.c
-MAN8=	mount_9fs.8
+MAN8=	mount_9fs.8.man
 
 CFLAGS = -ggdb -O0
 
diff --git a/sys/src/cmd/unix/9pfreebsd/mount_9fs/mount_9fs.8 b/sys/src/cmd/unix/9pfreebsd/mount_9fs/mount_9fs.8.man
similarity index 100%
rename from sys/src/cmd/unix/9pfreebsd/mount_9fs/mount_9fs.8
rename to sys/src/cmd/unix/9pfreebsd/mount_9fs/mount_9fs.8.man